<template>
	<div>

		<!-- 顶部滑动条区域 -->
		<div id="slider" class="mui-slider ">
				<div id="sliderSegmentedControl" class="mui-scroll-wrapper mui-slider-indicator mui-segmented-control mui-segmented-control-inverted">
					<div class="mui-scroll">
						<a :class="['mui-control-item',item.id==0?'mui-active':'']" v-for="item in cates" :key="item.id" @tap="getPhotoListByCateId(item.id)">
							{{item.title}}
						</a>
						
					</div>
				</div>
		</div>


		<!-- 图片列表区域 -->
		
		<ul class="photo-list">
			  <router-link v-for="item in list" :key="item.id" :to="'/home/photoinfo/'+item.id" tag="li">
			    <img v-lazy="item.img_url">
			    <div class="info">
			    	<h1 class="info-title">{{item.title}}</h1>
			    	<div class="info-body">{{item.zhaiyao}}</div>
			    </div>
			  </router-link>
		</ul>
		

	</div>
</template>
<script type="text/javascript">
// 1.导入mui的js文件
	import mui from "../../lib/mui/js/mui.min.js"

	

	

	export default{
		data(){
			return {
				cates:[],//所有分类列表数组
				list:[] //图片列表数据
			}
		},
		created(){
			this.getAllCategory();
			this.getPhotoListByCateId(0);//默认进入页面就请求所有图片
		},
		mounted(){ //当组件中的dom结构渲染好，并放到页面后，会执行这个钩子函数
			// 如果操作元素，最好在mounted里面，因为这时候的dom元素是最新的
		// 2.初始化滑动控件
			mui('.mui-scroll-wrapper').scroll({
			deceleration: 0.0005 //flick 减速系数，系数越大，滚动速度越慢，滚动距离越小，默认值0.0006
			});
		},
		methods:{
			getAllCategory(){
				//获取所有图片
				this.$http.get("api/getimgcategory").then(result=>{
					if(result.body.status===0){
						//手动拼接出最完整的数据
						result.body.message.unshift({title:'全部',id:0});
						this.cates=result.body.message;
					}
				})
				
			},
			getPhotoListByCateId(cateId){ //根据分类id，获取图片列表
				this.$http.get('api/getimages/'+cateId).then(result=>{
					if(result.body.status===0){
						this.list=result.body.message;
					}
				})

			}
		}
	}

</script>

<style lang="scss" scoped>
	*{
		touch-action:pan-y;
	}
	.photo-list{
		list-style: none;
		margin: 0;
		padding: 10px;
		padding-bottom: 0px;
		li{
			background-color: #ccc;
			text-align: center;
			margin-bottom:10px;
			box-shadow: 0 0 8px #999;
			position: relative;

			img{
				width: 100%;
				vertical-align: middle;
			}
			img[lazy=loading] {
			  width: 40px;
			  height: 300px;
			  margin: auto;
			}

			.info{
				color: white;
				text-align: left;
				position: absolute;
				bottom: 0px;
				background-color: rgba(0,0,0,0.4);
				max-height: 84px;
				.info-title{
					font-size: 14px;
				}
				.info-body{
					font-size: 13px;
				}
			}
		}
	}
	

</style>